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| author | Mingming Cao <cmm@us.ibm.com> | 2008-10-09 18:50:59 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-09 18:50:59 +0200 |
| commit | 1f7c14c62ce63805f9574664a6c6de3633d4a354 (patch) | |
| tree | 68f9f5399bc64bf7fe87dae16d8cc287717208bf | |
| parent | Linux 2.6.27 (diff) | |
| download | linux-1f7c14c62ce63805f9574664a6c6de3633d4a354.tar.xz linux-1f7c14c62ce63805f9574664a6c6de3633d4a354.zip | |
percpu counter: clean up percpu_counter_sum_and_set()
percpu_counter_sum_and_set() and percpu_counter_sum() is the same except
the former updates the global counter after accounting. Since we are
taking the fbc->lock to calculate the precise value of the counter in
percpu_counter_sum() anyway, it should simply set fbc->count too, as the
percpu_counter_sum_and_set() does.
This patch merges these two interfaces into one.
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/balloc.c | 2 | ||||
| -rw-r--r-- | include/linux/percpu_counter.h | 12 | ||||
| -rw-r--r-- | lib/percpu_counter.c | 8 |
3 files changed, 7 insertions, 15 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index e9fa960ba6da..00a94d5866c2 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -1624,7 +1624,7 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi, #ifdef CONFIG_SMP if (free_blocks - root_blocks < FBC_BATCH) free_blocks = - percpu_counter_sum_and_set(&sbi->s_freeblocks_counter); + percpu_counter_sum(&sbi->s_freeblocks_counter); #endif if (free_blocks <= root_blocks) /* we don't have free space */ diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h index 208388835357..9007ccdfc112 100644 --- a/include/linux/percpu_counter.h +++ b/include/linux/percpu_counter.h @@ -35,7 +35,7 @@ int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount); void percpu_counter_destroy(struct percpu_counter *fbc); void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); -s64 __percpu_counter_sum(struct percpu_counter *fbc, int set); +s64 __percpu_counter_sum(struct percpu_counter *fbc); static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount) { @@ -44,19 +44,13 @@ static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount) static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc) { - s64 ret = __percpu_counter_sum(fbc, 0); + s64 ret = __percpu_counter_sum(fbc); return ret < 0 ? 0 : ret; } -static inline s64 percpu_counter_sum_and_set(struct percpu_counter *fbc) -{ - return __percpu_counter_sum(fbc, 1); -} - - static inline s64 percpu_counter_sum(struct percpu_counter *fbc) { - return __percpu_counter_sum(fbc, 0); + return __percpu_counter_sum(fbc); } static inline s64 percpu_counter_read(struct percpu_counter *fbc) diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index 4a8ba4bf5f6f..a8663890a88c 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add); * Add up all the per-cpu counts, return the result. This is a more accurate * but much slower version of percpu_counter_read_positive() */ -s64 __percpu_counter_sum(struct percpu_counter *fbc, int set) +s64 __percpu_counter_sum(struct percpu_counter *fbc) { s64 ret; int cpu; @@ -62,11 +62,9 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc, int set) for_each_online_cpu(cpu) { s32 *pcount = per_cpu_ptr(fbc->counters, cpu); ret += *pcount; - if (set) - *pcount = 0; + *pcount = 0; } - if (set) - fbc->count = ret; + fbc->count = ret; spin_unlock(&fbc->lock); return ret; |